Frederica, the older sister. She contracts a demon, hunts the souls of the wicked, and sends them to hell. She is the silver seal. Howly, the younger brother. He was given his life by a demon, according to his sister's wish. He serves and protects the silver seal. He is the warrior seal. What will the world give to them... (Source: MU) Included one-shot: Volume 2: Aegis to Sono Shugosha (prototype one-shot)